Page 110 -

textual data

Your Programming Toolbox

You’ve got Chapter 2 under your
belt. Let’s look back at what you’ve
learned in this chapter: CHAPTER 2

Programming T ools

* Strings are sequences of individual characters.
* Individual string characters are referenced by index.

* Index values are offsets that start from zero.
* Methods provide variables with built-in functionality.

* Programming libraries provide a collection of related

pre-built code and functions.
* As well as having a value, data in variables also have a

“data type." Python T ools
* Number is a data type.
* String is a data type. * s[4] - access the 5th character of the variable “s",

which is a string

* s[6:12] - access a sub-string within the string “s" (up
to, but not including)
*s.find() method for searching strings

* s.upper() method for converting strings to
UPPERCASE

* float() converts strings to decimal point numbers
known as “floats"
* + addition operator
* > greater than operator

* urllib.request library for talking to the Web
* time library for working with dates/time

you are here 4 75